This is on my home MK3S+ - not an asmbly machine - but I thought it might be instructive. Folks, this is why you watch your first layer!
I use a BeagleCam with my MK3S+, and it is so damn reliable that I have gotten sloppy. So I started a print, and wandered off to do other projects, thinking I’d check it on the camera later. Well, I didn’t check until about 3 hours later, and this is the result!
After disassembling the fans and shrouds:
Yep, it got all the wires too…
After some initial cutting with flush cutters, reconnecting power to melt the hotend free… I’m left with these parts:
So at this point… I’m thinking MK3.9 upgrade is in my future. But then I need to print parts… and will probably need to use asmbly machines to do it. So let’s push through and see if it’s really busted… and it works! I don’t understand HOW those thermistor wires survived both the blob and the excavation work, but I’ll take it!
I printed this little guy (after a bunch of recalibration and self-tests) to make sure the printer works.
Anyway, after I stubbornly rescued my printer… I ordered a new Revo hotend anyway. 
Happy Halloween!